Please help I can’t move on to the next question until I submit this one I have 25 minutes

Answer:
Option (D)
Step-by-step explanation:
Linear equations are in the form of y = mx + b
Here, m = slope of the linear function
b = y-intercept
Quadratic function → y = ax² + bx + c
By these properties, y - 6 = x² represents the quadratic equation which is non linear.
Therefore, Option (D) will be the correct option.